Power-hammer.



H. C. SMITH.

POWER HAMMER.

APPLICATION FILED NOV. 20. 1914.

Patented Sept. 28, 1915.

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wi/bwemo H. 0. SMITH.

POWER HAMMER,

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COLUMBIA PLAHOGRAFH CO WASHINGTON. D. C.

Patented Sept. 28, 1915.

a SHEETS-SHEET a.

H. C. SMITH.

POWER HAMMER.

APPLICATION FILED NOV-20.1914- anve/wiioz WM 00% /7 f)/'y 5/77/77),

I 941 04 g I tg fi I HENRY COLLIER SMITH, OF DETROIT, MICHIGAN.

POWER-HAMMER.

Specification of Letters Patent.

Patented Sept. 28, 1215.

Application filed November 20, 1914. Serial No. 873,114.

To alt whom it may concern Be it known that I, HENRY COLLIER SMITH, a citizen of the United States, and a resident of Detroit, in the county ofWayne and State of Michigan, have invented a new and Improved Power-Hammer, of which the following is a specification.

This invention relates to power hammer and other blow-striking devices, and some of its objects are to provide means whereby the stroke of the hammer may be'varied while the driving shaft isin motion; to provide means for automatically causing the stroke to become zero when the operator leaves the machine or ceases to control the hammer; and to improve the construction of the machine generally.

This invention consists in a hammer or other blow-striking device comprising a rotatable driving shaft, a crank shaft carried thereby and rotatable in respect thereto, the axis of the crank shaft being offset from that of the driving shaft, a crank pin carried by the crank shaft and arranged to drive a hammer, and a manually actuted member movable longitudinally of the crank shaft whereby the latter is caused to rotate and the stroke of the hammer to be varied.

- It also consists inmeans for causing the axis of the crank pin to coincide with that of the driving shaft whenever the operator leaves the machine or ceases to operate the manually controlled means.

It further-consists in the details of construction shown, described and particularlv pointed out in the subjoined claims.

In the drawings, Figure 1 is a perspective view showing one embodiment of my invention. Fig. 2 is a vertical longitudinal section of the hammer actuating mechanism. Fig. 3 is a fragmentar front elevation of the hammer with the actuating mechanism in normal position; that is, in position such that no stroke is imparted to the hammer. JJioz 4- is a section on the line H of Fig. 2. Fig. 5 is a section on the line 5-5 of Fig. 2. Fig. 6 is a fragmentary horizontal sec tion showing the manner of connecting the bell crank to the longitudinally slidable member in the driving shaft.

Similar reference characters refer to like parts throughoutthe several views.

In the present embodiment of my invention, the hammer 1 is shown in position to act upon an anvil 2 carried by a bracket 3, the construction of which is immaterial. Lo-

cated above the anvil bracket and secured to the post 4 or other support in any suitable manner is a hammer bracket 5, that includes the spaced bearing boxes 6, the inner of which may be adjacent an opening 7 in an upstanding arm 8 of the bracket. These boxes are supplied with caps 11 that serve to retain the bushings 12, in which a rotatable driving shaft, the details of which will be pointed out later, is mounted. The bearings may be of the ring-oiling type (the rings not being shown) and the pullev shaft is preferably provided with the circumferential flanges 13, the function of which is to direct lubricant that has passed through the bearings into the annular cups 14; at each end thereof. From the cups the lubricant [flows through passages 15 back into the wells 16 of the'bearing boxes.

The pulley shaft preferably comprises a front section 20 and a rear section 21 the opposite ends of which may be reduced to form the bearing portions 22 and 23, respectively, that rest in the bushings 12. The adjacent ends of the sections are faced at 24 and shouldered at 25, and may include the half pulley sections 26, spaced apart laterally from the main portion of the corresponding shaft-section and connected there to at intervals by the perforated bosses 27 Through the latter the bolts 28, that secure the pulley sections rigidly together,-pass. It will be understood that the pulley may be formed in various ways, that described being preferred since it results in a considerable saving of material. The adjacent ends of the pulley sections are hollowed out to form a chamber 30 that may be extended into the bearing portion 23 as indicated at 31.

AXially alined with the pulley shaft and passing through the rear end thereof is a longitudinally shiftable rod 32, the front end of which may be-provided with the guides 33 (Figs. 2 and 4.) that embrace the key 34, the ends 35 of which are preferably supported in depressions in the wall of the chamber 30. The purpose of the guides and key is to prevent rotary movement of the rod 32 in respect to the pulley shaft. The rod is provided at its forward end with the spaced cross-walls 37, between which may be poured a Babbitt filling 38, having threads that engage with the threads on the rotatable crank shaft 41, supported in a bearing formed in the portion 22 of the pulley shaft. .One side of the rod 32 may be hollowed out as indicated at 4:2 to allow the crank shaft to be nested therein. Forward longitudinal movement of the crank shaft through the bearing is prevented by the collar43, that may be connected to it by the pin 44 and is in engagement with the 'with, or rigidly secured thereto, the crank arm 50 from which the crank pin 51 projects, the axis of the crank pin being offset from that of the crank shaft the same amount that the axis of the crank shaft is offset from the axis of the pulley shaft (Fig. 5). It will therefore be seen that at one point in the rotative movement of the crank shaft in respect to the pulley shaft the axis of the crank pin will be in coincidence with that of the pulley shaft, at which time the crankpin will be given no stroke; and that at all other points the crank pin will be given a stroke, the length of which depends on the angular displacement of the crank shaft in respect to the pulley shaft at the particular instant, and the maximum of which is equal to twice the amount theaxis of the crank shaft is offset from that of the pulley shaft. The rotation of the crank shaft is, of course, caused by longitudinal movement of the rod 32. The crank pin 51 supports the connecting rod 52 bearing the leaf spring 53 from which may be suspended, by means of the loops 5a and strap 55, or in any other desired manner, the hammer 1, that may be guided in its reciprocator movement by any suitable means 56.

The rod 32 may be moved longitudinally by mechanism, the particular construction of which will now be pointed out: The rear cylindrical end of the rod is received in the bore of a screw plug 60, threaded into a cavity formed in a housing 61; and the extreme rear end is preferablyreduced and has threaded thereon the collar 62, between which and the plug and housing the hard washers 63 and 64, respectively, may be interposed. The housing may be provided with the oil well 65 and oil passage 66, and the plug 60 may have its outer end formed to allow the application of a wrench whereby it may be adjustedin the housing. A set screw 67 may be threaded into the housing and preferably bears against a soft metallic filler 68 whereby the plug is secured in any position of angular adjustment. Upon opposite sides of the housing are formed the guides 71 (Fig. 6) between which the vertically slidable members 72 bearing the pins 7 3 are guided. These pins are received in openings formed in the divided'end 74 of the arm 75 of a bell-crank 7 6 that may swing about the pivot 77. The

other arm of the bell-crank is preferably pivotally connected to the link 78, the lower end of which is in turn pivoted-to the treadle 79 mounted on the fulcrum 80. It will be noticed that when pressure is applied to the foot-piece of the treadle the rod 82 is pulled outwardly wherebythe crank arm 50 will be swung in clockwise direction (Fig. '5) to carry the crank pin 51 away from the axis of the pulley shaft. Should the foot of the operator be removed fromthe treadle, the rod 32 is immediately thrust forwardly by I wall 8% of a groove 85 therein coming into contact with a pin 86 threaded or otherwise rigidly connected to the end of the pulley shaft. These. parts are preferably so ar ranged as to come into mutual engagement only when the crank pin is in alinement with the axis of the pulley shaft, or when the 7 It will Y stroke of the crank pin is zero. therefore be seen that when no pressure is applied to the treadle, the crank pin is automatically held in position such that no stroke is imparted to the hammer, and that the length of the stroke may be varied at will while the driving shaft is rotating.

It is clear that many changes may be made in the details of construction without de-.

parting from' the spirit of my. invention.

For example, the nut may be'arranged on the crank shaft instead of on the longituf dinally movable rod. It is also clear that the invention is. applicable to blow-striking machines other than those usually known as hammers, for instance, topercussion drills.

I do not, therefore, wish to be limited otherwise than as indicated in the subjoined claims. a

I claim 1. A device for striking blows-comprisa ing a rotatable driving shaft, means for applying force to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and offset from that of said driving shaft, a member movable longitudinally of the driving shaft, said member and said crank shaft being so arranged that longitudinal movement 'of the member causes rotative movement of thecrank' shaft, a crank pin carriediby said crank shaft, the axis of said pin being ofiset from the axis of the crank shaft, a blow: striking member operatively connected to said crank pin, and manually operable means for moving the longitudinally mov able member while the driving shaft is rotating whereby the axis of the crank pin is caused to recede from that of the driving shaft to increase the stroke of the blowstriking member.

A device. for striking blows comprising a rotatable driving shaft, means for applying force to the driving shaft to cause it to rotate, a. crank shaft supported thereby and rotatable in respect thereto, the axis of said crankshaft being parallel to and offset from that of said driving shaft, a mem ber movable longitudinally of the driving shaft, said member and said crank shaft being so arranged that longitudinal movement of the member causes rotative movement of the crank shaft, a crank pin carried by said crank shaft, the axis of said pin being offset from the axis of the crank shaft, a blowstriking 'member operatively connected to said crank pin, manually operable means for moving the longitudinally movable member while .the driving shaft is rotating whereby the'axis of: the crank pin is causedto recede from that of the driving shaft to increase the stroke of the blow-striking member, and means for normally holding the crank pin in position such that its axis is alined with that of the driving shaft.

3. A device for striking blows compris ing a rotatable driving shaft, means for applying force to the driving'shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and offset from that of said driving shaft, a member movable longitudinally of said driving shaft and rotatable therewith, said member and said crank shaft being so arranged that longitudinal movement of the member causes rotative movement of the crank shaft, a crank pin carried by said crank shaft, the axis of said pin being parallel to the axis of said crank shaft and offset therefrom the same distance the axis of the crankshaft is offset from the axis of the driving shaft, a blow-striking member operably connected to the crank pin, means tending to move the longitudinal movable member in one direction to cause the axis of the crank pin to approach that of the driving shaft, means for limiting the movement of the crank pin in the direction stated, and manually operable means for moving the longitudinally movable member in the opposite direction while the driving shaft is rotating whereby the axis of the crank pin is caused to recede from that of the driving shaft and the stroke of the blow-striking member is increased.

4-. A device for striking blows comprising a rotatable driving shaft having a chamber formed therein, means for applying force to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said pin carried by the crank shaft, the axis of said pin being parallel to the axis of said crank shaft and offset therefrom the same distance the axis of the crank shaft is offset from the axis of the driving shaft, a blow-striking member operably connected to the crank pin, means tending to move the rod in one direction to cause the axis of the crank pin to approach that of the driving shaft, means for limiting the movement of the crank pin in the direction stated and man ually operable means for moving the rod in the opposite direction while the driving shaft is in rotation whereby the axis of the crank pin is caused to recede from that of the driving shaft and the stroke of the blowstriking member is increased.

5. A device for striking blows comprising a rotatable driving shaft having a chamber formed therein, means for applying force to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and ofiset from that of said driving shaft, a rod movable longitudinally of said driving shaft and retatable therewith, the rod and crank shaft including interengaging surfaces located in the chamber and so arranged that longitudinal movement of the rod causes rotative movement of the crank shaft, a crank pin carried by the crank shaft, the axis of said pin being parallel to the axis of said crank shaft and offset therefrom the same distance the axis of the crank shaft is offset from the axis of the driving shaft, a blow-striking member operably connected to the crankpin, means connected to the rear end of said rod, in respect to which the rod is rotatable, for imparting longitudinal movement to the rod, means tending to move the last mentioned means in one direction whereby the axis of the crank-pin is caused to approach that of the driving shaft, means for limiting the movement of the crank-pin in the direction stated, and manually operable means for moving the rod in the opposite direction while the driving shaft is in rotation, whereby the axis of the crank-pin is caused to recede from that of the driving shaft and the stroke of the blow-striking member is increased.

6. A device for striking blows comprising a rotatable driving shaft having a chamber formed therein, means for applying force-to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and offset from that of said driving shaft, a rod movable longitudinally of said driving shaft and rotatable therewith, the rod and crank shaft including interengaging surfaces located in the chamber and so arranged that longitudinal movement of the rod causes rotative movement of the crank-shaft, a crank-pin carried by the crank shaft, the axis of said pin being parallel to the axis of said crank shaft and offset therefrom the same distance the axis of the crank shaft is offset from the axisof the driving shaft, a blow-striking member operably connected to the crankpin, a housing in which the rear end of the rod is received and in respect to which the rod is rotatable, a collar on the rod and inclosed by the housing, an adjustable plug in the housing and adapted to exert pressure on the collar to take up longitudinal movement of the rod in the housing, means tending to move the housing in one direction whereby the axis of the crank-pin is caused to approach that of the driving shaft, means for limiting the movement of the crank-pin in the direction stated, and 'manually operable means for moving the housing in the opposite direction while the driving shaft is in rotation, whereby the axis of the crankpin is caused to recede from that of the driving shaft and the stroke of the blow-striking member is increased.

7. A device for striking blows comprising a rotatable driving shaft having a chamber formed therein, means for applying force to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and offset from that of said driving shaft, a rod movable longitudinally of said driving shaft, a key contacting with the rod and serving to prevent the rod from rotating in respect to the driving shaft, the rod and the crank shaft ineluding inter-engaging threads located in the chamber and so arranged that longitudinal movement of the rod causes rotative 'movement of the crank shaft, a crank-pin carried by the crank shaft, the axis of said pin being parallel to theaxis of said crank shaft and offset therefrom the same'distance the axis of the crank shaft is oflset from the axis of the driving shaft, a blow-striking member operably connected to the crankpin, means tending to move the rod in one direction to cause the axis of the crank-pin to approach that of the driving shaft, means for limiting the movementof the crank pin in the direction stated, and manuallyop- .erable means for moving the rod in the op posite direction'while the driving shaft is in rotation whereby the axis of the crank-pin is caused to recede from'that of the'driving shaft and the stroke of the blow-striking memberis. increased.

8. A device for striking blows comprising a rotatable driving shaft having a chamber formed therein, means for applying force to.

the driving shaftvto cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and offset fromithat of said driving shaft, means for preventing longitudinal movement of the crankshaft in the driving shaft, a rod movable longitudinally of said driving shaft and rotatable therewith, the rod and crank shaft includ-,

ing inter-engaging surfaces located inthe chamber and so arranged that longitudinal -movement of the rod causes rotative movement of the crank shaft, a crank-pin carried by the crank shaft, the axis of said pin being parallel to the axis of said crank shaft and iofi'set therefrom the same distance the axis of the crank shaft is oifset from theaxis of the driving shaft, a blow-striking member operably connected to the crankpm, means tendlng to move the rod 1n one directlon to cause the axis of the crank-pin to approach that'of the driving shaft, means for limiting the movement of the crank-pin in the direction stated, and manually operable means for moving the rod in the opposite direction while the driving shaft is in rotation whereby theaxis of the crank-pin is caused torecede from that of the driving shaft and the stroke of the blow-striking member is increased.

9. A device for striking blows comprising a rotatable driving shaft having a chamber formed therein, means for applying force to the driving shaft to cause'it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and ofiset from that of said driving shaft, means for preventing longitudinal movement of the crank shaft in the driving shaft, a rod movable longitudinally of said driving shaft, means for preventing the rodfrom rotatingin respect to the driving shaft, the rod and crank shaft includinginter-engaging surfaces located in the chamber and so arranged that longitudinal movement o'f'the rod causes rotative movement of the crank shaft, a crank-pin carried by the crank shaft, theaxis-ofsaid pin being parallel to the axis of said crank shaft and ofiset therefrom the same distance the axis of the crank shaft'is oflsetfrom the axis of the driving shaft, a blow-striking member operably connected to the crank pin,

means tending to move the rod in one di- 7 rection to causethe axis of the crank-pin to approach that of the driving shaft, means for limiting the movement of the crank-pin in the directionstated, and manually operable means for moving the rod in the opposite direction While the driving shaft is in rotation whereby the axis of the crank-pin is caused to recede from that of the driving shaft and the stroke of the blow-striking member is increased.

'10. A device for striking blows compris ing a rotatable driving shaft having a chamber formed therein, means for applying force to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and offset from that of said driving shaft, a rod movable longitudinally of said driving shaft and rotatable therewith, the rod and crank shaft including inter-engaging surfaces located in the chamber and so arranged. that longitudinal movement of the rod causes rotative movement of the crank shaft, a crank arm and crank pin carried by the crank shaft, the axis of said pin being parallel to the axis of said crank shaft and offset therefrom the same distance the axis of the crank shaft is offset from the'axis of the driving shaft, a blow-striking member operably connected to the crank pin, means tending to move the rod in one direction to cause the axis of. the crank pin to approach that of the driving shaft, said crank arm and driving shaft constituting two members, a projection on one of the members arranged to contact with a surface on the other member for limiting the movement of the crank pin in the direction stated, and manually operable means for moving the rod in the. opposite direction while the driving shaft is in rotation whereby the axis of the crank pin is caused to recede from that of the driving shaft and the stroke of the blow-striking member is increased.

11. A device for striking blows comprising a rotatable driving shaft having aninclosed chamber formed therein, means for applying force to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and offset from that of said driving shaft, a rod movable longitudinally of said driving shaft and rotatable therewith, the rod and crank shaft including inter-engagingsurfaces le cated in the chamber and so arranged that longitudinal movement of the rod causes rotative movement of the crank shaft, a crank pin carried by the crank shaft, the axis of said pin being parallel to the axis of sa d crank shaft and ofl set therefrom the same distance the axis of the crank shaft is offset from the axis of the driving shaft, a blow-striking member operably connected to the crank pin, means tending to move the rod in onedirection to cause the axis of the crank pin to approach that of the driving shaft, means for limiting the movement of the crank pin in the direction stated, manually operable means for moving the rod in the opposite direction While the driving shaft is in rotation whereby the axis of the crank p1nis caused to recede from that of the driving shaft and the stroke of the blowstriking member is increased, said driving shaft having an opening leading to the chamber, therein through which lubricant may be supplied, and a removable plug for said opening.

12. A device for striking blows comprisinga rotatable driving shaft having a chamber formed therein, means for applying force to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and offset from that of said driving shaft, a rodmovable longitudinally of said driving shaft and rotatable therewith, the rod and crank shaft including inter-engaging surfaces located in the chamber and so arranged that longitudinal movement of the rod causes rotative movement of the crank shaft, a crank pin carried by the crank shaft, the axis of said pin being parallel to the axis of said crank shaft and offset therefrom the same distance the axis of the crank shaft is offset from the axis of the driving shaft, a blowstriking member operably connected to the crank-pin, a housing connected to the rear end of said rod, in respect to which the rod is rotatable, for imparting longitudinal movement to the rod, a guide arranged transversely of the housing, a member slidable in the guide, a lever having one arm in proximity to the slidable member, said member and said arm being pivotally connected, means tending to move the lever in one direction whereby the axis of the crank pin is caused to approachthat of the driving shaft, means for limiting the movement of the crank pin in the direction stated, and manually operable means for moving thedever in the opposite direction while the driving shaft is in rotation, whereby the axis of the crank pin is caused to recede from that of the driving shaft and the stroke of the blowstriking member is increased.

[3. A device for striking blows comprising a rotatable driving shaft, means for applying force to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and offset from that of said driving shaft, a member movable longitudinally of the driving shaft, said member and said crank shaft being so arranged that longitudinal movement of the member causes rotative movement of the crankshaft, a crank pin carried by said crank shaft, the axis of said pinbeing 0E- set from'the axis of the crank shaft, a blowstriking member operatively connected to said crank pin, and arranged to reciprocate in a radial plane passing through the axis of the driving shaft, means for guiding the blow-striking member in its reciprocation, and manually operable means for moving the longitudinally movable member while the driving shaft is rotating whereby the axis of the crank pin is caused to recede from that of the driving shaft to'increase the stroke of the blow striking member.

14. A device for'striking blows comprising a rotatable driving shaft, means for applying force to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being'parallel to and offset from that of said driving shaft, a member movable longitudinally of the driving shaft, said member and said crank shaft being so arranged that longitudinal movement of the member causes rotative movement of the crank shaft, a'crank pin carried by said crank shaft, the axis of said pin being offset from the axis of the crank shaft, a blowstriking member operatively connected to saidcrank pin-and arranged to reciprocate in a radial plane passing through the axis of the driving shaft, means for guiding the blow-striking member in its'recip'rocation, manuallyoperable means for moving the longitudinally movable member while the driving shaft is rotating wherebv the axis of the crank pin is caused to recede from that ,of the driving 'shaft'to increase the stroke of the blow-striking member, and means for normally holding the crank pin in position such that its axis is alined with that of the driving'shaft.

15. In combinatioma rotatable driving shaft, means for applying force to thedriving shaft to causeit to rotate, a crank shaft 7 supported thereby and rotatable inirespect manually operable means for moving the thereto, the axis of'said crank shaft being parallel to and offset from that of said driving shaft, a member movable longitudinally of the driving shaft, said member and said crankshaft being so arranged, that longitudinal movement of the member causes rotative movement of the crank shaft, a crank pin carried by said crank shaft, the axis of said pin being offset from the axis of the crank shaft,a reciprocable member operatively connected to said crank pin, and

longitudinally movable member while the driving shaft is rotating whereby the axis of p the crank pin is caused to recede from that of the driving shaft to increase the stroke of the reciprocable member. 7 v

16. In combination, a rotatable driving shaft, means for applying force to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axisjof said crank shaft being parallel to and offset from that ofsaid driving shaft, a member movable'longitudinally of the driving shaft, said member and said crank shaft being so arranged that longitudinal movement of the member causes rotative movement of the crank shaft, a crank pin carried by said crank shaft, the axis of said pin vbeing offsetfrom the axis ofrthe crank shaft, a reciprocablemember opera tively connected to said crank pin and armeans for applying force to the driving shaft to causeit to 'rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel toand offset from that of said driving'. shaft, a rod movable longitudinally of said driving shaft and rotatable therewith,

the rod and crank shaft including inter-engaging surfaces located in the chamber and so arranged that longitudinal movement of the rod causes rotative' movement of the crank shaft, a crank pin carried by the crankshaft, the axis of said pinbeing parallel to the axis of saidcrank shaft and off set therefrom the same'distance the axis of the crank shaft is'offset from the axis of the driving shaft, a reciprocable member oper-* atively connected to said crank pin and arranged to reciprocate in a radial plane passing through the axis of the driving shaft, means for guiding the reciprocable member in its reciprocation, means tendingto move the rod in one direction-to cause the axis of the crank pin to approach that of the driv-' ing shaft, means for limiting the movement of the crank pin in the direction stated, and

manually operable. means for moving the rod in the opposite direction while the driving shaft is in rotationwhereby the axis of the crank pin is caused to recede from that of the driving shaft and the stroke ofthe reciprocable memberis increased. a

18. In combination, a rotatable driving shaft having a chamber formed therein, means for applying force to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and offset from that of said driving shaft, a rod movable longitudinally of said driving shaft and rotatable therewith, the rod and crank shaft including inter-engaging surfaces located in the chamber and so arranged that longitudinal movementof the rod causes rotative movement of the crank-shaft, a crank-pin carried by the crank shaft, the axis of said pin being parallel to the axis of said crank shaft and offset there from the same distance the axis of the crank shaft is offset from the axis of the driving shaft, a reciproca-ble member operably connected to the crank-pin, a housing in which the rear end of the rod is received and in respect to which the rod is rotatable, a collar on the rod and inclosed bythe housing, an adjustable plug in the housing and adapted to exert pressure on the collar to take up longitudinal movement of the rod in the housing, means tending to move the housing in one direction whereby the axis of the crank-pin is caused to approach that of the driving shaft, means for limiting the movement of the crank-pin in the direction stated, and manually operable means for moving the housing in the opposite direction While the driving shaft is in rotation, whereby the axis of the crank-pin is caused to recede from that of thedriving shaft and the stroke of the reciprocable member is increased.

19. In combination, a rotatable driving shaft having a chamber formed therein, means for applying force to the driving shaft to cause it'to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and offset from that of said driving shaft, a rod movable longitudinally of said driving shaft, a key contacting With the rod and serving to prevent the rod from rotating in respect to the driving shaft, the rod and the crank shaft including inter-engaging threads located in the chamber and so arranged that longitudinal movement of the rod causes rotative movement of the crank shaft, a crankpin carried by the crank shaft, the axis of said pin being parallel to the axis of said crank shaft and offset therefrom the same distance the axis of the crank shaft is offset from the axis of the driving shaft, a reciprocable member operably connected to the crank-pin, means tending to move the rod in one direction to cause the axis of the crank-pin to approach that of the driving shaft, means for limiting the movement of the crank-pin in the direction stated, and manually operable means for moving the rod in the opposite direction while the driving shaft is in rotation whereby the axis of the crank-pin is caused to recede from that of the driving shaft and the stroke of the reciprocable member is increased.

20. In combination, a rotatable driving shaft having a chamber formed therein, means for applying force to the driving shaft to cause it to rotate, a crank shaft being parallel to the axis of said crank shaft and offset therefrom the same distance the axis of the crank shaft is offset from the axis of the driving shaft, a reciprocable member operably connected to the crankpin, means tending to move the rod in one direction to cause the axis of the crank-pin to approach that of the driving shaft, means for limiting the movement of the crank-pin in the direction stated, and manually operable means for moving the rod in the opposite direction While the driving shaft is in rotationwhereby the axis of the crank-pin. is caused to recede from that of the driving shaft and the stroke of the reciprocable member is increased.

21. In combination, a rotatable driving shaft having a chamber formed therein, means for applying force to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and offset from that of said driving shaft, means for preventing longitudinal movement of the crank shaft in the driving shaft, a rod movable longitudinally oft-said driving shaft, means'for preventing the rod from rotating in respect to the driving shaft, the rod and crank shaft including inter-engaging surfaces located in the chamber and s0 arranged that longitudinal movement of the rod causes rotative movement of the crank shaft, a crank-pin carried by the crank shaft, the axis of said pin being parallel to the axis of said crank shaft and offset therefrom the same distance the axis of the crank shaft is offset from the axis of the driving shaft, a reciprocable member operably connected to the crank pin, means tending to move the rod'in one direction to cause the axis of the crank-pin to approach that of thedriving shaft, means for limiting the movement of the crank-pin in the direction stated, and manually operable means for moving the rod in the opposite direction While the driving shaft is in rotation where by the axis of the crankpin is caused to recede from that of the driving shaft and the stroke of the reciprocable member is increased.

22. I11 combination, a rotatable driving shaft having a chamber formed therein,

means for applying force to the driving shaft to cause it to rotate, a crankshaft supported thereby and rotatable in respect thereto, the axis of said crank. shaft being parallel to and offset from that of said driving shaft, a rod movable longitudinally of said driving shaft and rotatable therewith, the rod and crank shaft including interengaging surfaces located in the chamber and so arranged that longitudinal movement of the rod causes rotative movement of the 01 ank shaft, a crank arm and crank pin carried by the crank shaft, the axis of said pin being parallel to the axis of said-crank shaft and ofiset therefrom the same distance 1 the axis of the crank shaft is offset from the approach that of the driving shaft, said crank arm and driving shaft constituting two members, a projection on one of the members arranged to contact with a surface on the other member for limiting the movement of the crank pin in the direction stated, and manually operable means for moving the rod in the opposite direction While the driving shaft is in rotation whereby the axis of the crank pin is caused to recede from that of the driving shaft and the stroke of the reciprocable member is increased.

23. In combination, a rotatable driving shaft having an inclosed chamber formed therein, means for applying force to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable in respect thereto, the axis of said crank shaft being parallel to and offset from that of the driving shaft, a rod movable longitudinally of said driving shaft and rotatable there with, the rod and crank shaft including in ter-engaging surfaces located in the chamber and so arranged that longitudinal movement of the rod causes rotative movement of the crank shaft, a crank pin carried by the crank shaft, the axis of said pin being parallel to the axis of said crank shaftand'offset therefrom the same distance the axis of the crank shaft is offset from the axis of the driving shaft, a reciprocable member operably connected to the crank pin, means tending to move the rod in one direction to cause 7 the axis of the crank pin to approach that of the driving shaft, means for limiting the movement of the crank pin in the direction Copies of this patent may be obtained for five cents each,by addressing v Washington, D. 0.

axis of the crank pin is caused to recede from that of the driving shaft and the stroke of the reciprocable member is increased, said driving shaft having an opening leading to the chamber therein through which lubricant may be-supplied, and a removable plug for said opening. p

24. In combination, a rotatable driving shaft having a chamber formed. therein, means for applying force to the driving shaft to cause it to rotate, a crank shaft supported thereby and rotatable 1 in respect thereto, the axis of said crank shaft being parallel to and offset from that of said driving shaft, a rod movable longitudinally of said driving shaft and rotatabletherewith, the rod and crank shaft including interengaging surfaces located in the chamber and so arranged that longitudinalmovement of the rod causes rotative movement of the crank-shaft, a, crank pin carried by the crank shaft,.the axis of said pin being parallel to the axis of said crank shaft and offset therefrom the same distance the axis of the crank shaft is offset from the axis of the driving shaft, a reciprocable member operably connected to the crank-pin, a housing connected to therear end of said rod, in respect to which the rod is rotatable, for imparting longitudinal movement to the rod, a guide arranged transversely of thehousing, a member slidable in the guide,-,a lever having one arm in proximity to the slidable member, said member and said arm being pivotally connected, means tending to move the lever in one direction whereby the axis of the crank pin is caused to approach that of the driving shaft, means for limiting the the stroke of the reciprocablemember is increased.

In testimony whereof I have signed this specification in the presence of twosubscribing witnesses. r

' HENRY COLLIERSMITH.

Witnesses:

' L. M. SPENCER,

--Hneo W. KREINBRING.

anovement of the crank pin in the direction the fiCommissioner of Patents. l 

